Experimental Study on Near-Net-Shape Forming of Titanium Alloy Powders Complex Parts by Hot Isostatic Pressing

摘要

Titanium alloy possesses excellent comprehensive properties and it has been widely used in various fields. Due to its small thermal conductivity, low specific heat and active chemical property features, etc, titanium alloy material is hard to process. Conventional powder metallurgy can over-come this problem,but it is difficult to produce complex parts. Hot isostatic pressing (HIP) has been used to near-net-shape forming titanium al-loy powders complex parts recently. In the present research, the powder produced by plasma rotating electrode process was near-net-shape formed into cross-shaped parts by hot isostatic pressing directly under the HIPing parameters of 950°C/110MPa/3h. The microstructures of dif-ferent places of the as-HIPed samples were investigated using optical microscopy. The distribution of the density of the cross-shaped parts was investigated by measuring the densities of different places. Results showed that cross-shaped parts without surface defects can be obtained,with-out defects such as macroscopic elemental segregation,crack or porosity.